Symplectic approach to lightcone QCD

The problem of quantization of lightcone QCD

There exists the problem to construct a quantum algebra of observables in lightcone QCD beyond the perturbative regime. It has recently established that the boundary gauge fields are crucial for a consistent construction of the classical dynamic system. If the gauge group is non-Abelian and there are four or more space-time dimensions then the procedure of symplectic reduction gives a classical dynamical system with very complicated Hamiltonian having infinite power over the coupling constant. Then, to quantize the theory one should to construct a Poisson algebra and to quantize it. Careful an…

使用最小光锥变量集的树级QCD振幅的雷吉因子化

Regge factorization of tree-level QCD amplitudes using a minimal set of lightcone variables

本研究利用最小光锥变量集分析树级QCD振幅的雷吉因子化，提取各类多部分子多雷吉发射顶点并构建MREV程序库，同时验证了结果的一致性。

来自格点QCD的重介子光锥分布振幅

Heavy meson lightcone distribution amplitudes from Lattice QCD

针对重夸克有效理论中光锥分布振幅第一性原理确定的理论挑战，本文提出一种连续使用有效场论的实用方法，利用新生成的格点系综进行了开创性的格点计算，为重介子LCDAs提供了新见解，并讨论了其对重到轻跃迁形状因子的影响。

Quantum Field Kinetics of QCD: Quark-Gluon Transport Theory for Lightcone Dominated Processes

A quantum kinetic formalism is developed to study the dynamical interplay of quantum and statistical-kinetic properties of non-equilibrium multi-parton systems produced in high-energy QCD processes. The approach provides the means to follow the quantum dynamics in both space-time and energy-momentum, starting from an arbitrary initial configuration of high-momentum quarks and gluons. Using a generalized functional integral representation and adopting the `closed-time-path' Green function techniques, a self-consistent set of equations of motions is obtained: a Ginzburg-Landau equation for a pos…

The LPM effect in sequential bremsstrahlung: incorporation of "instantaneous'' interactions for QCD

The splitting processes of bremsstrahlung and pair production in a medium are coherent over large distances in the very high energy limit, which leads to a suppression known as the Landau-Pomeranchuk-Migdal (LPM) effect. We continue study of the case when the coherence lengths (formation lengths) of two consecutive splitting processes overlap, avoiding soft-emission approximations. Previous work made a ``nearly-complete'' calculation of the effect of overlapping formation times on gluonic splittings such as $g \to gg \to ggg$ (with simplifying assumptions such as an infinite QCD medium and the…

Symplectic SUSY Gauge Theories with Antisymmetric Matter

We investigate the confining phase vacua of supersymmetric $Sp(2\NC)$ gauge theories that contain matter in both fundamental and antisymmetric representations. The moduli spaces of such models with $\NF=3$ quark flavors and $\NA=1$ antisymmetric field are analogous to that of SUSY QCD with $\NF=\NC+1$ flavors. In particular, the forms of their quantum superpotentials are fixed by classical constraints. When mass terms are coupled to $W_{(\NF=3,\NA=1)}$ and heavy fields are integrated out, complete towers of dynamically generated superpotentials for low energy theories with fewer numbers of mat…